Sealeaf is a modular hydroponic floating agricultural system for urban coastal environments that challenges the systems of land use and a culture of global food importation by returning food production to the centre of its consumption. By 2015, a project 340 million people will reside in the worlds 21 megacities, of which 18 are coastal. Feeding these cities against a backdrop of explosive population growth, urbanization, rising sea levels, desertification and a demand for abundance will become a challenge beyond that of our existing infrastructure. However we at SEALEAF believe that while our working urban space decreases and prices can only increase there is still ‘land’ available to us. This land surrounds our cities, is largely under utilized, is cheap and is actually increasing.